Exam 17: Statistical Applications in Quality Management

Which of the following best measures the ability of a process to consistently meet specified customer-driven requirement?

TABLE 17-10 Below is the number of defective items from a production line over twenty consecutive morning shifts. -Referring to Table 17-10, based on the c chart, there appears to be a special cause of variation in the process.

CPL > 1 implies that the process mean is more than 3 standard deviation away from the lower specification limit.

TABLE 17-5 A manufacturer of computer disks took samples of 240 disks on 15 consecutive days. The number of disks with bad sectors was determined for each of these samples. The results are in the table that follows. -Referring to Table 17-5, the best estimate of the mean proportion of disks with bad sectors is ________.

TABLE 17-2 A political pollster randomly selects a sample of 100 voters each day for 8 successive days and asks how many will vote for the incumbent. The pollster wishes to construct a p chart to see if the percentage favoring the incumbent candidate is too erratic. -Referring to Table 17-2, what is the numerical value of the lower control limit for the p chart?

TABLE 17-8 Recently, a university switched to a new type of computer-based registration. The registrar is concerned with the amount of time students are spending on the computer registering under the new system. She decides to randomly select 8 students on each of the 12 days of the registration and determine the time each spends on the computer registering. The range, mean, and standard deviation of the times required to register are in the table that follows. -Referring to Table 17-8, an R chart is to be constructed for the time required to register. One way to create the upper control limit involves multiplying the mean of the sample ranges by D₄. For this data set, the value of D₄ is ________.

Which famous statistician developed the 14 points of quality?

TABLE 17-7 A supplier of silicone sheets for producers of computer chips wants to evaluate her manufacturing process. She takes samples of size 5 from each day's output and counts the number of blemishes on each silicone sheet. The results from 20 days of such evaluations are presented below. -Referring to Table 17-7, based on the R chart, it appears that the process is out of control.

TABLE 17-9 The manufacturer of canned food constructed control charts and analyzed several quality characteristics. One characteristic of interest is the weight of the filled cans. The lower specification limit for weight is 2.95 pounds. The table below provides the range and mean of the weights of five cans tested every fifteen minutes during a day's production. -Referring to Table 17-9, an R chart is to be constructed for the weight. The center line of this R chart is located at ________.

TABLE 17-9 The manufacturer of canned food constructed control charts and analyzed several quality characteristics. One characteristic of interest is the weight of the filled cans. The lower specification limit for weight is 2.95 pounds. The table below provides the range and mean of the weights of five cans tested every fifteen minutes during a day's production. -Referring to Table 17-9, estimate the percentage of the cans whose weight is inside the specification limit.

TABLE 17-10 Below is the number of defective items from a production line over twenty consecutive morning shifts. -Referring to Table 17-10, based on the c chart, no opportunity appears to be present to render an improvement in the process.

TABLE 17-9 The manufacturer of canned food constructed control charts and analyzed several quality characteristics. One characteristic of interest is the weight of the filled cans. The lower specification limit for weight is 2.95 pounds. The table below provides the range and mean of the weights of five cans tested every fifteen minutes during a day's production. -Referring to Table 17-9, an R chart is to be constructed for the weight. The upper control limit for this data set is ________.

Referring to Table 17-7, construct an chart for the number of blemishes.

TABLE 17-2 A political pollster randomly selects a sample of 100 voters each day for 8 successive days and asks how many will vote for the incumbent. The pollster wishes to construct a p chart to see if the percentage favoring the incumbent candidate is too erratic. -Referring to Table 17-2, what is the numerical value of the center line for the p chart?

Referring to Table 17-3, suppose the analyst constructs an chart to see if the production process is in-control. What is the center line for this chart?

TABLE 17-10 Below is the number of defective items from a production line over twenty consecutive morning shifts. -Referring to Table 17-10, a c chart is to be constructed for the number of defective items. The upper control limits is ________.

Which of the following is not part of the Shewhart-Deming cycle?

Referring to Table 17-4, what percentage of the time it takes workers to complete an important production task will fall inside the specification limits?

Which of the following is not one of Deming's 14 points?

Referring to Table 17-3, suppose the analyst constructs an chart to see if the production process is in-control. Which expression best describes this chart?